Re: Class 2 power supply

Marc,

Thanks. I am planning on using a 24V unregulated supply for the proximity
switches. This same supply will also control some 24V relays. The relays
are used for the emergency power off circuit.

I am now down to the final wiring for my new cnc router.

Bob

----- Original Message -----
From: D.F.S. <dfs@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Friday, February 18, 2000 12:51 PM
Subject: Re: [CAD_CAM_EDM_DRO] Class 2 power supply


> From: "D.F.S." <dfs@...>
>
> >
> > From: "Bob Campbell" <bob@...>
> >
> > I just received some four wire DC proximity switches from Automation
Direct.
> > On the package they say that a class 2 power supply is required (10-30
Vdc).
> >
> > Does anyone know what the mean by class 2.
>
> My understanding, limited I admit, is it is simply part of electrical
> standards and related requirements.
>
> Unless I mistaken is it simply electrical eqpt or supplied with voltage,
and
> maybe current output or requirements below a given voltage.
>
> I think it is part of a certification as well, like underwriters Labs.
>
> I was thinking it was 24V, but from what your stuff says, it must be
> a little higher.
>
> In many areas, by code You could wire class 2 stuff yourself, and not
> need an inspection or permit.
> If it was higher voltage, you could not.
>
> It is probably to prevent crap like electrical inspectors that would
> require you to run waterproof conduit to house the wires that run
> the solenoids of your sprinklers, and have it permitted and done by a
> licensed electricial contractor.
>
> The logic is probably "How much damage can a guy do with 30 volts and
> a limited current supply?, even if he screws it up?"
>
> The wording of the requirements are probably more to state this is not
> approved electrical eqpt, for something like in parallel with a gate
> motor running off 110V AC.
>
> Marc
>
>
>
>
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